135 lines
4.4 KiB
Markdown
135 lines
4.4 KiB
Markdown
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---
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id: bad87fee1348bd9aed308826
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challengeType: 6
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forumTopicId: 18321
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localeTitle: 使用 jQuery 选择元素的父元素
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---
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## Description
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<section id='description'>
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每个 HTML 标签都默认<code>继承（inherits）</code>其<code>父标签（parent element）</code>的 CSS 属性。
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例如，<code>h3</code>标签<code>jQuery Playground</code>的父标签是<code><div class="container-fluid"></code>，<code><div class="container-fluid"></code>的父标签是<code>body</code>。
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jQuery 有一个<code>parent()</code>方法，可以访问被选取标签的父标签。
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下面的代码展示了使用<code>parent()</code>方法把<code>left-well</code>标签的父标签背景色设置成<code>蓝色（blue）</code>的方式：
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<code>$("#left-well").parent().css("background-color", "blue")</code>
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请把<code>#target1</code>标签的父标签背景色设置成<code>红色（red）</code>。
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>left-well</code>标签应该有红色的背景。
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testString: assert($("#left-well").css("background-color") === 'red' || $("#left-well").css("background-color") === 'rgb(255, 0, 0)' || $("#left-well").css("background-color").toLowerCase() === '#ff0000' || $("#left-well").css("background-color").toLowerCase() === '#f00');
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- text: 应该用<code>.parent()</code>方法修改该标签。
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testString: assert(code.match(/\.parent\s*\(\s*\)\s*\.css/g));
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- text: 应该在<code>#target1</code>标签上调用<code>.parent()</code>方法。
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testString: assert(code.match(/\$\s*?\(\s*?(?:'|")\s*?#target1\s*?(?:'|")\s*?\)\s*?\.parent/gi));
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- text: 仅用 jQuery 给标签添加类。
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testString: assert(code.match(/<div class="well" id="left-well">/g));
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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});
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</script>
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<!-- 请修改本行以上的代码 -->
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<body>
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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</body>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```html
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<script>
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$(document).ready(function() {
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$("#target1").css("color", "red");
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$("#target1").prop("disabled", true);
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$("#target4").remove();
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$("#target2").appendTo("#right-well");
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$("#target5").clone().appendTo("#left-well");
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$("#target1").parent().css("background-color", "red");
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});
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</script>
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<!-- Only change code above this line. -->
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<body>
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<div class="container-fluid">
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<h3 class="text-primary text-center">jQuery Playground</h3>
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<div class="row">
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<div class="col-xs-6">
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<h4>#left-well</h4>
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<div class="well" id="left-well">
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<button class="btn btn-default target" id="target1">#target1</button>
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<button class="btn btn-default target" id="target2">#target2</button>
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<button class="btn btn-default target" id="target3">#target3</button>
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</div>
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</div>
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<div class="col-xs-6">
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<h4>#right-well</h4>
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<div class="well" id="right-well">
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<button class="btn btn-default target" id="target4">#target4</button>
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<button class="btn btn-default target" id="target5">#target5</button>
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<button class="btn btn-default target" id="target6">#target6</button>
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</div>
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</div>
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</div>
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</div>
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</body>
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```
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</section>
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